Parasitology Exam 2

A host that carries a parasite that does not reproduce or grow within the host

paratenic host

tegument

How do species of tapeworms get food/nutrients if they lack a digestive tract?

Cook the fish to a minimum of 145C or freeze the fish for at least 7 days at -4F

Diphyllobothrium latum is a parasite that infects fish and can be transmitted to humans. How can we avoid exposure to this parasite?

Kidneys

Flatworms have a group(s) of flame cells that combine to form a protonephridium. This functions as which organ/system for the body?

dorsoventrally flattened. leaf or oval shape. bilaterally symmetrical

Platyhelminthes general morphology

skin like covering, protective layer, nutrient absorption

Tegument

single host (no intermediate), often hermaphroditic. example- ectoparasites.

Monogenea

Multiple hosts (includng intermediate hosts), asexual AND sexual reproduction

Digenea

aka liver flukes. Digenetic, usually a intermediate host is a mollusk. Large % lifecycle outside host. Depedent on water.

Treamatodes overview?

egg contains developing embryo which becomes miracidium, which moves through water and contains apical penetration glands (proteolytic enzymes in apical gland) for entering next host. Contains embryonic tissue for sporocyst, which migrates in intermediate host.

Trematodes lifecycle

free-swimming, ciliated larval stage in which a parasitic fluke passes from the egg to its first host. no digestive system.

Miracidium life cycle